保定一次寒潮降雪诊断分析

Diagnosis and Analysis of a Cold Wave Snowfall in Baoding

利用NCEP资料、卫星云图以及国家自动观测站数据,对保定市2018年1月21—23日天气形势进行了诊断分析。结果表明,此次寒潮为“横槽型”寒潮。由于冷空气移动路径偏西且较弱,因而寒潮强度一般。高空槽与冷锋的配合下,产生了降雪天气。低层偏东风以及中层偏南气流提供了降水的水汽条件。

Using NCEP/NCAR day-to-day 6 h reanalysis data,satellite image and automatic weather stations observations,the cold wave process in Baoding on January 21-23,2018 was diagnosed and analyzed.The results showed that this cold wave was the"transverse trough"type.Because the moving path of cold air was westward and weak,the cold wave intensity was general.With the cooperation of the highaltitude trough and the cold front,the snowfall weather occurred,the lowlevel eastward wind and the middlelevel southerly wind provided the water vapor condition for the precipitation.